Fig. 1. (a) Overview of digitized sample (gray/dark represents soil matrix and white represents pore space). (bcde) Part (200 by 200 pixels) of digitized sample (indicated in a with black lines) at different water contents (black represents soil matrix, gray represents water phase, and white represents gas phase). The size of the digitized sample is 1444 by 2388 pixels and each side of a pixel is 4.4 mm.

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